Hi, I tried to run the latest Linux tree (4a10a91756ef381bced7b88cfb9232f660b92d93) as DOM0 Xen. After destroying a guest using network, I got the following lines in the DOM0 kernel log: unregister_netdevice: waiting for vif1.0 to become free. Usage count = 1 The bisector pointed the problem after the commit efb6de9b4ba0092b2c55f6a52d16294a8a698edd "netfilter: bridge: forward IPv6 fragmented packets". This is happening on an xgene board. The bridge is configured using /etc/network/interfaces: # The primary network interface auto xenbr0 iface xenbr0 inet dhcp hostname pony bridge_ports eth0 bridge_stp off bridge_waitport 0 bridge_fd 0 bridge_maxwait 0 Xen tools is creating the interface vif1.0 and adding to the bridge xenbr0. Linux log: device eth0 entered promiscuous mode xenbr0: port 1(eth0) entered forwarding state xenbr0: port 1(eth0) entered forwarding state xenbr0: port 1(eth0) entered disabled state xgene-enet 17020000.ethernet eth0: Link is Down random: nonblocking pool is initialized [....] Configuring network interfaces... Waiting for a max of 0 seconds for eth0 to become available. Internet Systems Consortium DHCP Client 4.3.1 Copyright 2004-2014 Internet Systems Consortium. All rights reserved. For info, please visit https://www.isc.org/software/dhcp/ Listening on LPF/xenbr0/00:01:73:02:1a:00 Sending on LPF/xenbr0/00:01:73:02:1a:00 Sending on Socket/fallback DHCPDISCOVER on xenbr0 to 255.255.255.255 port 67 interval 7 xgene-enet 17020000.ethernet eth0: Link is Up - 1Gbps/Full - flow control rx/tx xenbr0: port 1(eth0) entered forwarding state xenbr0: port 1(eth0) entered forwarding state DHCPDISCOVER on xenbr0 to 255.255.255.255 port 67 interval 13 DHCPREQUEST on xenbr0 to 255.255.255.255 port 67 DHCPOFFER from 10.80.224.1 DHCPACK from 10.80.224.1 bound to 10.80.229.126 -- renewal in 19083 seconds. done. [ ok ] Starting rpcbind daemon.... [ ok ] Starting NFS common utilities: statd idmapd. [ ok ] Cleaning up temporary files.... [info] Setting console screen modes. setterm: cannot (un)set powersave mode: Inappropriate ioctl for device [....] Setting up console font and keymap...Couldn't get a file descriptor referring to the console Couldn't get a file descriptor referring to the console done. [ ok ] Setting up X socket directories... /tmp/.X11-unix /tmp/.ICE-unix. INIT: Entering runlevel: 2 [info] Using makefile-style concurrent boot in runlevel 2. [ ok ] Starting enhanced syslogd: rsyslogd. [ ok ] Starting deferred execution scheduler: atd. [ ok ] Starting periodic command scheduler: cron. [ ok ] Starting SMP IRQ Balancer: irqbalance. [ ok ] Starting NTP server: ntpd. [ ok ] Starting OpenBSD Secure Shell server: sshd. [ ok ] Starting system message bus: dbus. Starting /usr/local/sbin/xenstored... Setting domain 0 name, domid and JSON config... Done setting up Dom0 Starting xenconsoled... Starting QEMU as disk backend for dom0 Debian GNU/Linux 8 pony hvc0 pony login: device vif1.0 entered promiscuous mode IPv6: ADDRCONF(NETDEV_UP): vif1.0: link is not ready xen-blkback: ring-ref 8, event-channel 3, protocol 1 (arm-abi) persistent grants vif vif-1-0 vif1.0: Guest Rx ready IPv6: ADDRCONF(NETDEV_CHANGE): vif1.0: link becomes ready xenbr0: port 2(vif1.0) entered forwarding state xenbr0: port 2(vif1.0) entered forwarding state (XEN) mm.c:1251:d0v2 gnttab_mark_dirty not implemented yet xenbr0: port 2(vif1.0) entered disabled state xenbr0: port 2(vif1.0) entered disabled state device vif1.0 left promiscuous mode xenbr0: port 2(vif1.0) entered disabled state INIT: Id "1" respawning too fast: disabled for 5 minutes INIT: Id "3" respawning too fast: disabled for 5 minutes INIT: Id "5" respawning too fast: disabled for 5 minutes INIT: Id "2" respawning too fast: disabled for 5 minutes INIT: Id "6" respawning too fast: disabled for 5 minutes INIT: Id "T0" respawning too fast: disabled for 5 minutes INIT: Id "4" respawning too fast: disabled for 5 minutes unregister_netdevice: waiting for vif1.0 to become free. Usage count = 1 unregister_netdevice: waiting for vif1.0 to become free. Usage count = 1 unregister_netdevice: waiting for vif1.0 to become free. Usage count = 1 Regards, -- Julien Grall